Herschel and Keck take census of the invisible universe

By combining the observing powers of the European Space Agency’s (ESA) Herschel Space Observatory and the ground-based Keck telescopes, astronomers have characterized hundreds of previously unseen starburst galaxies, revealing extraordinarily high star-formation rates across the history of the universe.

Starburst galaxies give birth to hundreds of solar masses’ worth of stars each year in short-lived but intense events. By comparison, the Milky Way Galaxy, on average, produces the equivalent of only one Sun-like star per year.

Starburst galaxies generate so much starlight that they should outshine our galaxy hundreds to thousands of times over, but the enormous quantities of gas fueling them also contain vast amounts of dust as a result of the frantic star formation.

The dust absorbs much of the visible light, meaning that many of them look quite insignificant in that part of the spectrum. However, the dust is warmed by the surrounding hot stars and re-emits the energy at far-infrared wavelengths.

Using ESA’s infrared Herschel Space Observatory, astronomers measured the temperature and brightness of thousands of dusty galaxies. From this data, they could then calculate star-formation rates.

“Starburst galaxies are the brightest galaxies in the universe and contribute significantly to cosmic star formation, so it’s important to study them in detail and understand their properties,” said Caitlin Casey of the University of Hawaii. “Some of the galaxies found in this new survey have star-formation rates equivalent to the birth of several thousand solar-mass stars per year, constituting some of the brightest infrared galaxies yet discovered.”

To provide context to the observations and understand how star formation has changed over the universe’s 13.7-billion-year history, the distances to the galaxies were also needed.

With Herschel signposting the way, Casey’s team used spectrometers on the twin 10-meter W. M. Keck telescopes on Mauna Kea, Hawaii, and obtained the redshifts of 767 of the starburst galaxies.

Redshifts provide astronomers with a measure of how long the light from each galaxy has traveled across the universe, which, in turn, indicates when in cosmic history the light from each galaxy was emitted.

For most of the galaxies, it was found that the light has been traveling toward us for 10 billion years or less.

About 5 percent of the galaxies are at even greater redshifts: Their light was emitted when the universe was only 1–3 billion years old.

“The Herschel data tell us how fiercely and prolifically these galaxies are producing stars,” said Seb Oliver from University of Sussex, United Kingdom. “Combining this information with the distances provided by the Keck data, we can uncover the contribution of the starburst galaxies to the total amount of stars produced across the history of the universe.”

How such large numbers of starburst galaxies formed during the first few billions of years of the universe’s existence poses a vital problem for galaxy formation and evolution studies.

One leading theory proposes that a collision between two young galaxies could have sparked an intense, short-lived phase of star formation.

Another theory speculates that when the universe was young, individual galaxies had much more gas available for them to feed from, enabling higher rates of star formation without the need of collisions.

“It’s a hotly debated topic that requires details on the shape and rotation of the galaxies before it can be resolved,” said Casey.

“Before Herschel, the largest similar survey of distant starbursts involved only 73 galaxies. We’ve improved on that by over a factor of 10 in this combined survey with Keck to determine the characteristics of this important galaxy population,” said Göran Pilbratt from ESA.

Looking back on the universe’s history for a specific patch of the sky observed by Herschel and Keck to reveal many previously unseen starburst galaxies. This graphic shows a representation of the distribution of nearly 300 galaxies in one 1.4 x 1.4 degree field of view. In total, Keck identified 767 galaxies found by Herschel. Five starburst galaxies (as seen by the ESA/NASA Hubble Space Telescope) are shown as insets. The light from the nearest galaxy shown in the insets has been traveling towards us for 2.6 billion years, while the furthest inset galaxy it has been traveling for 10.2 billion years. The galaxies were first detected by ESA’s Herschel space observatory, and an example of one of the far-infrared fields of view is shown in the graphic. The redshifts were determined by the ground-based W.M. Keck telescopes. // Credits: ESA–C. Carreau/C. Casey (University of Hawaii); COSMOS field: ESA/Herschel/SPIRE/HerMES Key Programme; Hubble images: NASA/ESA

By combining the observing powers of the European Space Agency’s (ESA) Herschel Space Observatory and the ground-based Keck telescopes, astronomers have characterized hundreds of previously unseen starburst galaxies, revealing extraordinarily high star-formation rates across the history of the universe.

Starburst galaxies give birth to hundreds of solar masses’ worth of stars each year in short-lived but intense events. By comparison, the Milky Way Galaxy, on average, produces the equivalent of only one Sun-like star per year.

Starburst galaxies generate so much starlight that they should outshine our galaxy hundreds to thousands of times over, but the enormous quantities of gas fueling them also contain vast amounts of dust as a result of the frantic star formation.

The dust absorbs much of the visible light, meaning that many of them look quite insignificant in that part of the spectrum. However, the dust is warmed by the surrounding hot stars and re-emits the energy at far-infrared wavelengths.

Using ESA’s infrared Herschel Space Observatory, astronomers measured the temperature and brightness of thousands of dusty galaxies. From this data, they could then calculate star-formation rates.

“Starburst galaxies are the brightest galaxies in the universe and contribute significantly to cosmic star formation, so it’s important to study them in detail and understand their properties,” said Caitlin Casey of the University of Hawaii. “Some of the galaxies found in this new survey have star-formation rates equivalent to the birth of several thousand solar-mass stars per year, constituting some of the brightest infrared galaxies yet discovered.”

To provide context to the observations and understand how star formation has changed over the universe’s 13.7-billion-year history, the distances to the galaxies were also needed.

With Herschel signposting the way, Casey’s team used spectrometers on the twin 10-meter W. M. Keck telescopes on Mauna Kea, Hawaii, and obtained the redshifts of 767 of the starburst galaxies.

Redshifts provide astronomers with a measure of how long the light from each galaxy has traveled across the universe, which, in turn, indicates when in cosmic history the light from each galaxy was emitted.

For most of the galaxies, it was found that the light has been traveling toward us for 10 billion years or less.

About 5 percent of the galaxies are at even greater redshifts: Their light was emitted when the universe was only 1–3 billion years old.

“The Herschel data tell us how fiercely and prolifically these galaxies are producing stars,” said Seb Oliver from University of Sussex, United Kingdom. “Combining this information with the distances provided by the Keck data, we can uncover the contribution of the starburst galaxies to the total amount of stars produced across the history of the universe.”

How such large numbers of starburst galaxies formed during the first few billions of years of the universe’s existence poses a vital problem for galaxy formation and evolution studies.

One leading theory proposes that a collision between two young galaxies could have sparked an intense, short-lived phase of star formation.

Another theory speculates that when the universe was young, individual galaxies had much more gas available for them to feed from, enabling higher rates of star formation without the need of collisions.

“It’s a hotly debated topic that requires details on the shape and rotation of the galaxies before it can be resolved,” said Casey.

“Before Herschel, the largest similar survey of distant starbursts involved only 73 galaxies. We’ve improved on that by over a factor of 10 in this combined survey with Keck to determine the characteristics of this important galaxy population,” said Göran Pilbratt from ESA.